(1) hot dip galvanized steel grating flat center spacing: According to distinguish between series: Series 1 30mm; Series 2 is 40mm; Series 3 is 60mm.(2) hot dip galvanized steel grating bar center distance: Series 1 100mm, Series 2 is 50mm..Other specifications can be made under customers' order.(3) hot dip galvanized steel, flat steel grid plate: Material for the Q235A or stainless steel, a common plane type, tooth type and section I slip type.Common specifications are 20 * 5,25 * 5,25 * 3,32 * 5,32 * 5.40 * 5.40 * 3,50 * 5,65 * 5,75 * 6,100 * 8,100 * 10and so on.(4) hot dip galvanized steel grating bar: material Q235A, or 304 stainless steel for the bar, twisted square steel, square steel or six angles.Twisted square steel plate garden by drawing upon and twisted from side mode, the common specifications are 5 * 5,6 * 6,8 * 8mm and so on.